Feature Enhancement: Enable Icon Integration for Custom Components (#1433)

This pull request introduces a significant enhancement to our project,
specifically aimed at empowering developers to seamlessly integrate
icons into custom components. The goal is to provide a flexible and
intuitive way to enhance UI elements with visual cues, thereby improving
user experience and interface aesthetics.

src/backend/langflow/interface/custom/custom_component/component.py

@@ -6,6 +6,7 @@ from typing import Any, ClassVar, Optional
 import emoji
 from cachetools import TTLCache, cachedmethod
 from fastapi import HTTPException
+
 from langflow.interface.custom.code_parser import CodeParser
 from langflow.utils import validate
 
@@ -20,7 +21,9 @@ class ComponentFunctionEntrypointNameNullError(HTTPException):
 
 class Component:
     ERROR_CODE_NULL: ClassVar[str] = "Python code must be provided."
-    ERROR_FUNCTION_ENTRYPOINT_NAME_NULL: ClassVar[str] = "The name of the entrypoint function must be provided."
+    ERROR_FUNCTION_ENTRYPOINT_NAME_NULL: ClassVar[str] = (
+        "The name of the entrypoint function must be provided."
+    )
 
     code: Optional[str] = None
     _function_entrypoint_name: str = "build"
@@ -96,11 +99,12 @@ class Component:
         # we are going to use the emoji library to validate the emoji
         # emojis can be defined using the :emoji_name: syntax
         if not value.startswith(":") or not value.endswith(":"):
-            raise ValueError("Invalid emoji. Please use the :emoji_name: syntax.")
-
+            warnings.warn("Invalid emoji. Please use the :emoji_name: syntax.")
+            return value
         emoji_value = emoji.emojize(value, variant="emoji_type")
         if value == emoji_value:
-            raise ValueError(f"Invalid emoji. {value} is not a valid emoji.")
+            warnings.warn(f"Invalid emoji. {value} is not a valid emoji.")
+            return value
         return emoji_value
 
     def build(self, *args: Any, **kwargs: Any) -> Any:

src/frontend/src/CustomNodes/GenericNode/index.tsx

@@ -1,4 +1,4 @@
-import { useEffect, useState } from "react";
+import { useCallback, useEffect, useState } from "react";
 import { NodeToolbar } from "reactflow";
 import ShadTooltip from "../../components/ShadTooltipComponent";
 import Tooltip from "../../components/TooltipComponent";
@@ -107,6 +107,39 @@ export default function GenericNode({
 
   const nameEditable = data.node?.flow || data.type === "CustomComponent";
 
+  const emojiRegex = /\p{Emoji}/u;
+  const isEmoji = emojiRegex.test(data?.node?.icon!);
+
+  const iconNodeRender = useCallback(() => {
+    const iconElement = data?.node?.icon;
+    const iconColor = nodeColors[types[data.type]];
+    const iconName =
+      iconElement || (data.node?.flow ? "group_components" : name);
+    const iconClassName = `generic-node-icon ${
+      !showNode ? "absolute inset-x-6 h-12 w-12" : ""
+    }`;
+
+    if (iconElement && isEmoji) {
+      return nodeIconFragment(iconElement);
+    } else {
+      return checkNodeIconFragment(iconColor, iconName, iconClassName);
+    }
+  }, [data, isEmoji, name, showNode]);
+
+  const nodeIconFragment = (icon) => {
+    return <span className="text-lg">{icon}</span>;
+  };
+
+  const checkNodeIconFragment = (iconColor, iconName, iconClassName) => {
+    return (
+      <IconComponent
+        name={iconName}
+        className={iconClassName}
+        iconColor={iconColor}
+      />
+    );
+  };
+
   return (
     <>
       <NodeToolbar>
@@ -156,19 +189,7 @@ export default function GenericNode({
                 (!showNode && "justify-center")
               }
             >
-              {data?.node?.icon ? (
-                <span className="text-lg">{data?.node?.icon}</span>
-              ) : (
-                <IconComponent
-                  name={data.node?.flow ? "group_components" : name}
-                  className={
-                    "generic-node-icon " +
-                    (!showNode ? "absolute inset-x-6 h-12 w-12" : "")
-                  }
-                  iconColor={`${nodeColors[types[data.type]]}`}
-                />
-              )}
-
+              {iconNodeRender()}
               {showNode && (
                 <div className="generic-node-tooltip-div">
                   {nameEditable && inputName ? (